Driving apparatus for car-lighting generators.



' w. l. THOMSON.

DRIVING APPARATUS FOR CAR LIGHTING GENERATORS.

APPLICATION FILED MAR. 13. I915.

Patented Dec. 10, I918.

2 SHEETSSHEET 1- III 1 1n" W. I. THOMSON. DRIVYIVNG APPARATUS FOR CARLIGHTING GENERATORS.

APPLICATION FILED MAR. 13. 19'5.

Patented Dec. 10, 1818 2 SHEETS-SHEET 2.

5 nva ntoz WILLIAM I. THOMSON, OF NEWARK, NEW JERSEY, ASSIGNOR TO THESAFETY OAR HEATING & LIGHTING COMPANY, A CORPORATION OF NEW JERSEY.

DRIVING APPARATUS. FOR OAR-LIGHTING GENERATORS.

Specification of Letters Patent.

Patented Dec. 10, 1918.

Application filed March 13, 1915. Serial No. 14,207.

To all whom it may concern:

Be it known that I, WILLIAM I. THOMSON, a citizen of the United States,and residing at Newark, in the county of Essex and State of New Jersey,have invented a new and Improved Driving Apparatus for Oar-LightingGenerators, of which the following specification is a full disclosure.

This invention relates to driving apparatus for car lighting generatorsand meth ods of making certain parts thereof.

One of the objects thereof is to provide practical and etlicientapparatus of the above type which will be reliable under conditions ofhard, practical use; Other objects are to provide apparatus of the abovetype of simple, durable and inexpensive construction. Another object isto provide a practical and convenient art for making certain portions ofthe above apparatus. Other objects will be in part obvious and in partpointed out hereinafter.

The invention accordingly consists in the features of construction,combinations of elements, arrangements of parts, and in the severalsteps and relation and order of such steps, all as hereinafter pointedout and the scope of the application of which will be indicated in thefollowing claims.

In the accompanying drawings, in which is shown one of various possibleembodiments of this invention. Figure 1 is a side elevation of a portionof a railway car with driving apparatus mounted thereon, certain partsbeing broken away in order to show the construction more clearly.

Fig. 2 is a side elevation of a generator pulley partially in sectionalong the line BB of Fig. 3.

Fig. 3 is an edge view of this pulley partially in section along theline A-A of Fig. 2.

Fig. 4: is a side elevation of another pulley, certain parts beingbroken away to show the construction more clearly.

Fig. 5 is a similar view of a portion of this pulley, the parts beingshown upon a larger scale. 4

Fig. 6 is a sectional bottom plan taken along the line C-O of Fig. 5.

Fig. 7 is a sectional view taken along the line DD of Fig. 5.

Similar reference characters refer to similar parts. throughout thevarious views of the drawings,

Referring now to Fig. 1 of the drawings, there is diagrammaticallyindicated at 1 a portion of a railway car body, one end of which ismounted upon the truck 2 running upon the rails S. This truck is of theusual construction and one of its axles 4 is provided with a pulley 5,shown in detail in Figs. 4 to 7 of the drawings.

Mounted upon the floor frame of the body 1, to swing about a shaft 6 inbrackets 7, is an electrical generator 8 provided with a pulley 9. Thisgenerator is pivotally connected with shaft 6 by means of lugs 10 and isnormally retracted or swung away from the truck as by the spring 11secured to an arm 12 laterally extending from one of the lu s 10.

- Tulleys 9 and 5 are normally substantially in alinement and areconnected by the belt 13.

Considering now, the construction of pulley 5, reference is made to Fig.4: of the drawings in which this device is shown in detail. This pulleyis formed in separable parts, preferably two in number, which meet oneanother to complete the pulley along the lines 11 and the hub portions15 of which are bolted or clamped one to another as by means of thebolts 16. In this manner, the pulley may be mounted upon a car axle andsecurely clamped in position.

It has been found that'in apparatus of this general nature, particularlywhen it is subjected to winter use in northern climates, when the carstops or is laid up for a greater or less time. there is a likelihood ofthe entire belt becoming frozen into substantially rigid form and thusfailing to perform its functions, even though the car be moved and theaxle duly turned.

This condition may remain indefinitely in cold weather and render thegenerating apparatus inoperative.

To do away with this defect in action and attain other advantages. thereis provided upon the face of the pulley a frict onal member 17. Thismember preferably takes the form of a canvas strip which is impregnatedwith balata.

The method of applying this member is substantially as follows: Holes 18are first drilled at substantially equal intervals about the face ofboth sections of the pulley on each side and at the meeting edges of thepulley face, where the sections join, addibeing during this coolingoperation firmly held in place. At this stage, holes are formed in thefrictional member registering with all of the holes in the pulley faceand rivets are passed through these riveting holes and headed, beingpreferably countersunk in the member 17 as indicated at 19. In thismanner there is insured perfect registry of the rivet holes land thefrictional member is rigidly held in place, both mechanically, by therivets and the flanges 20, as well as adhesively, due to the action ofthe balata. The frictional member may then be severed along the lines ofjunction of the pulley sections, although if desired it may be placed inposition in separate sections corresponding to the face of each pulleysection. The member placed thus mountedvirtually forms a portion of thepulley itself and maintains its position under the hardest conditions ofuse.

As there is a tendency of the icy belt to slip to an undesirable extentupon the generator pulley 8, the latter device is formed as indicated inFigs. 2 and 3 of the drawings. The pulley face 21 is bored with holes 22about the circumference at each side of the pulley and with additionalholes 23 extending across the pulley in two adjacent lines,substantially at the points 24 and 25.

Upon the pulley face being cleaned, a frictional strip 26 impregnatedwith balata is wound tightly about the pulley, preferably in a pluralityof layers, and ending as at 27 in such form that the resultant pulleyface is substantially even. It will be seen that one end of the strip26, the inner end, comes opposite the line of rivets 24, whereas theouter end comes opposite the point 25. With the parts in this position,holes registering with the various holes in the pulley face are boredthroughout all thicknesses of the member 26 and counter-sunk rivets 28inserted and secured in place. The frictional member is then bound inposition tightly against the pulley face, and the pulley heated andpermitted to cool in this position. In this manner, the impregnatedstrip adheres not only to the pulley face but to itself from one layerto another, and there is provided a frictional surfacing of considerabledepth which is reliably held in place.

It is to be noted that the frictional members upon both pulleys'are ofsubstantially heat-insulating constituents, and it may be noted that theterm heat insulating is used as descriptive of a substance whichconducts heat with difficulty.

Considering now the action of this apparatus, if a car is set in motionafter being exposed to a severe northern climate, with the beltsubstantially in the condition hereinbefore described, the pulley 5,being rotated with great force, first breaks lose from the belt eventhough the latter be frozen in position. Its outer frictional surface isnow rotated with respect to the inner side of the adjacent portion ofthe belt and this speed of rotation reaches a high value even withmoderate train speeds, as its peripheral speed is often over half thatof the linear rate of travel of the car.

The friction due to this relative movement quickly generates aconsiderable amount of heat as distinguished from the effect of thesmooth face of an ordinary steel pulley which is itself cold and whichquickly withdraws and radiates any insignificant amount of heat whichmay be evolved. Here, however, there is not only a very substantialamount of heat generated but, due to the heat-insulating character ofthe frictional member, this is not transmitted readily to the pulley andthus dissipated but is held at this point of generation. This heatquickly thaws the adjacent portions of the belt, and the high rotativetendency upon the belt,

'due to the large coefficient of friction of member 17, causes theformer to creep in the direction of rotation and by small gradationsexpose its entire length to the effect of the heat. In this manner theapparatus is quickly placed in full operative condition, theformation'of the generator pulley preventing slipping at that point eventhough the belt still be somewhat icy.

It will thus be seen that there is provided simple and reliableapparatus in which the objects of this invention are achieved and whichnot only eliminates certain important defects in running but isotherwise highly advantageous.

As many changes might be made in the above arrangement, and as manyapparently different embodiments 'might be made 0 this invention withoutdeparting from the scope thereof, it is intended that all featuresherein described or shown in the accompanying drawings shall beinterpreted as illustrative and not in a limiting sense.

Having "thus revealed this invention, I claim as new and desire tosecure the following combinations of elements, or equivalents thereof,by Letters Patent of the United States 1. In car-axle-driven electricalapparatus, in combination with the car axle, a pulley upon the car axle,a generator positioned beneath the car, a pulley upon said generator, abelt connecting said pulleys, and

means, adapted to heat the belt upon said first pulley.

2. In car-axle-driven electrical apparatus, in combination with the caraxle, a pulley upon the car axle, a generator positioned beneath thecar, a pulley upon said generator,- a belt connecting said pulleys, andheat-generating means upon said first pulley against which said beltrests.

3. In car-axle-driven electrical apparatus, in combination with the caraxle, a pulley upon the car axle, a generator positioned beneath thecar, a pulley upon said generator, a belt connecting said pulleys, andmeans adapted to prevent conduction toward said pulley of heat generatedby relative movement of said pulley and the belt resting thereon.

4. In car-axle-driven electrical apparatus, in combination with the caraxle, a pulley upon the car axle, a generator positioned beneath thecar, a pulley upon said generator,

a belt connecting said pulleys, and frictional means of heat insulatingmaterial upon said first pulley against which said belt rests.

5. In car-axle-driven electrical apparatus, vin combination with the caraxle, a pulley upon the car axle, a generator positioned beneath thecar, a pulley upon said generator, a belt connectmg said pulleys, and amember of heat-insulating frictional mate'- rial positioned upon theface of one of said pulleys and securedthereto.

means extending about the face of said pulley and riveted thereon.

8. In car-axle-driven electrical apparatus, in combination with the caraxle, a flanged pulley formed in a plurality of sections,

means adapted to secure said sections in assembled relation upon the caraxle, and heat-generating means secured to the pulley face of each ofsaid sections independently of the flanges. of said pulley.

9. In car-axle-driven electrical apparatus, in combination with the caraxle, a pulley secured upon said axle, and heat-generating meansextending about the face of said pulley and adhesively secured theretoand riveted thereto at spaced points throughout its edges.

In witness whereof, I hereunto subscribe my name, as attested by the twosubscribing witnesses.

WILLIAM I. THOMSON.

Witnesses:

FRANK BERKES, H. K. WILLIAMS.

